Gerris Solver
1- Re=160
2- Re=1600
These pictures were taken 30 s after the flow starts, steady state solutions are obtained, very little differences can be observed.
Remember, The Strouhal number is a weak function of the Reynolds number
3 and 4, the same previous two cases, but the pictures taken after 0.1 s so you can observe the differences
cannot upload eps or mpg files, sorry